Hi
Challenge Salmon and Potato has recently been launched, it's been co-developed with Sharon Pinkerton (Bareve German Wirehaired Pointers). My breeder told me about it and I'm going to try some when I next see her - I like the idea of no rice. My boys love the AG Salmon so I'm sure they'll take to this too. It's currently free postage for 2 bags.
I've heard good things about AG White Fish and Potato as well. If you ring direct or email them they will send some tester bags for you to try. You can join their breeder plan but if you shop around you can usually get the same price or lower and with free postage too. (Currently £36.39 for AG Breeders rates).
Edited to say: I see klb also suggested Challenge food. I'm sure that wasn't there when I hit reply - I must have taken so long to write the message :) !!